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https://issues.apache.org/jira/browse/LUCENE-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088838#comment-13088838
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Robert Muir commented on LUCENE-3218:
-------------------------------------
{quote}
This looks really nice and easier to understand.
{quote}
I agree! At a glance, it seems this design looks much better to and avoids the
sneaky delegation problems.
Only one minor thing glancing at the patch: in MockDirectoryWrapper, can we
track that the handle is actually closed?
> Make CFS appendable
> ---------------------
>
> Key: LUCENE-3218
> URL: https://issues.apache.org/jira/browse/LUCENE-3218
> Project: Lucene - Java
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 3.4, 4.0
> Reporter: Simon Willnauer
> Priority: Blocker
> Fix For: 3.4, 4.0
>
> Attachments: LUCENE-3218.patch, LUCENE-3218.patch, LUCENE-3218.patch,
> LUCENE-3218.patch, LUCENE-3218.patch, LUCENE-3218_3x.patch,
> LUCENE-3218_test_fix.patch, LUCENE-3218_tests.patch
>
>
> Currently CFS is created once all files are written during a flush / merge.
> Once on disk the files are copied into the CFS format which is basically a
> unnecessary for some of the files. We can at any time write at least one file
> directly into the CFS which can save a reasonable amount of IO. For instance
> stored fields could be written directly during indexing and during a Codec
> Flush one of the written files can be appended directly. This optimization is
> a nice sideeffect for lucene indexing itself but more important for DocValues
> and LUCENE-3216 we could transparently pack per field files into a single
> file only for docvalues without changing any code once LUCENE-3216 is
> resolved.
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